fix(issue-19): match the daemon's whole script path so spaced sandbox paths are reaped

Review round 2 (planner-reviewer-codex-01, NOT PASS P2):

- conftest `_is_subscriber_daemon_argv`: `ps -o args=` joins argv unquoted,
  so the script path is taken from the shell word up to the first
  `/reconcile.sh --subscribe` instead of as one whitespace token. A sandbox
  or --basetemp path with a space no longer hides its daemon from the
  fixture reaper and the session leak guard. A candidate with whitespace
  counts only when it names an existing file, so a bash wrapper under the
  root whose later argv carries the words is still excluded.
- tests: a whitespace-path selector regression and an owned live-process
  cleanup check (both fail on c096cb4); the R-2 test also pins the bash
  wrapper exclusion.
- docs: the polling fallback's signal handling is stated precisely in
  monitor SKILL.md and VERSIONS.md (a running --once pass finishes first,
  the interval's sleep child ends on its own); create SKILL.md says an
  already-running daemon's PID is still reported under the opt-out;
  VERSIONS selector wording and test count (14).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HCGpJXhSZasJLU38ksDghe

.agents/skills/multi-agent-mux-monitor/SKILL.md

@@ -84,7 +84,10 @@ per workspace through `lib.sh::start_watchdog` (`lib_py.delegation.daemon`). Tha
   the lock (the python subscriber released it on exit), so while polling it does not
   exclude a second daemon, as before;
 - **stops promptly on `SIGTERM`/`SIGINT`** — the bash wrapper forwards the signal to the
-  python subscriber and exits 143. `SIGKILL` is never required;
+  python subscriber and exits 143. In the broker-down polling fallback the signal cuts the
+  interval wait short, but a reconcile pass (`--once`) already running finishes first, and
+  the interval's `sleep` child is left to end on its own (≤ `RECONCILE_POLL_INTERVAL`).
+  `SIGKILL` is never required;
 - is **not started when `MAM_NO_SUBSCRIBER_DAEMON=1`** — the literal `1` only. Use it when
   the monitor is supervised elsewhere; a daemon that already runs is still reported. Test
   sandboxes set it by default and additionally reap any daemon anchored in the sandbox.